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|
# urxvt prepends "use strict; use utf8;\n", screwing with our line numbers
#line 3
=head1 NAME
cwd-spawn - open a new urxvt within the current working directory.
=head1 INSTALLATION
1) adjust your F<.Xresources>
URxvt*perl-lib: /home/user/.urxvt
URxvt*perl-ext: cwd-spawn
URxvt*keysym.M-o: perl:cwd-spawn
2) copy/symlink this script into F</home/user/.urxvt>
3) adjust your shell config to include these functions
(known to work with zsh/bash/ksh)
cwd_to_urxvt() {
local update="\0033]777;cwd-spawn;path;$PWD\0007"
case $TERM in
screen*)
# pass through to parent terminal emulator
update="\0033P$update\0033\\";;
esac
echo -ne "$update"
}
cwd_to_urxvt # execute upon startup to set initial directory
ssh_connection_to_urxvt() {
# don't propagate information to urxvt if ssh is used non-interactive
[ -t 0 ] || [ -t 1 ] || return
local update="\0033]777;cwd-spawn;ssh;$1\0007"
case $TERM in
screen*)
# pass through to parent terminal emulator
update="\0033P$update\0033\\";;
esac
echo -ne "$update"
}
4) adjust F<.ssh/config>
Host *
PermitLocalCommand yes
LocalCommand ssh_connection_to_urxvt "%r %h %p"
5) execute cwd_to_urxvt each time you change your directory.
# zsh supports hooks which execute each time you change your cwd:
chpwd_functions=(${chpwd_functions} cwd_to_urxvt)
Support for other shells are left as an exercise for the reader ;-)
=head1 BUGS
C<ssh> doesn’t invoke LocalCommand if you connect through “master” mode.
Thus C<cwd-spawn> always copies the connection information into the new terminal.
While this works fine for a single connection, it fails if you nest ssh connections (as a slave through “master” mode).
As a workaround, manually invoke C<ssh_connection_to_urxvt "user host 22">.
=head1 COPYRIGHT AND LICENSE
Copyright (C) 2011 Maik Fischer L<maikf+urxvt@qu.cx>
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
=cut
sub _octal_escape {
my ($string) = @_;
my $escape = sub {
my ($char) = @_;
ord($char) > 127
? $char
: sprintf("\0%.3o", $char)
};
$string =~ s!([^A-Za-z0-9/_-])!$escape->($1)!sge;
return $string;
}
use Encode;
my $utf8 = Encode::find_encoding('UTF-8');
sub on_osc_seq_perl {
my ($self, $osc, $resp) = @_;
return unless $osc =~ s/^cwd-spawn;//;
# decode raw bytestring into utf8
local $@;
$osc = eval { $utf8->decode($osc, Encode::FB_CROAK) };
if ($@) {
warn "cwd-spawn: called with garbage: $@";
return;
}
return unless $osc =~ s/^(path|ssh);//;
my $cmd = $1;
my $storage = $self->{'cwd-spawn'} ||= {};
if ($cmd eq 'path') {
# path sanitizing is context specific, we do that in on_user_command
$storage->{path} = $osc;
} else {
my ($user, $host, $port) = split ' ', $osc;
# user and port are arguments to parameters, we can pass them as-is
# host may be used to pass arbitrary parameters to ssh
return if $host =~ /^-/;
@{$storage}{qw/user host port/} = ($user, $host, $port);
}
$self->_dump if $ENV{DEBUG_URXVT_CWDSPAWN};
return 1;
}
sub on_user_command {
my ($self, $cmd) = @_;
return unless $cmd eq 'cwd-spawn';
$self->_dump if $ENV{DEBUG_URXVT_CWDSPAWN};
my $storage = $self->{'cwd-spawn'}
or return;
my ($cwd, $user, $host, $port) = @{$storage}{qw/path user host port/};
my $name = 'URxvt'; # hardcode for now
my @args;
if ($host) {
# escape $path here since it is subject to shell-expansion
my $path = _octal_escape($cwd);
@args = (
'-e',
'ssh', '-t', '-p', $port, '-l', $user, $host,
"cd \"$path\"; exec \$SHELL -l"
)
} else {
@args = ('-cd', $cwd);
}
warn "cwd-spawn: would start urxvt with: @args"
if $ENV{DEBUG_URXVT_CWDSPAWN};
my $term = urxvt::term->new($self->env, $name, @args);
# ssh doesn't execute LocalCommand if used through ControlMaster
# see BUGS in POD
$term->cmd_parse("\e]777;cwd-spawn;ssh;$user $host $port\a") if $host;
return;
}
sub _dump {
my $storage = shift->{'cwd-spawn'};
warn 'cwd-spawn: $storage is empty!' unless $storage;
warn sprintf('cwd-spawn: ' . ('%s: "%s" ' x keys %$storage), %$storage);
}
# vim: set ts=4 sw=4 sts=4 ft=perl expandtab:
|
